CNN Thursday turned the important battleground state of Wisconsin from "lean Obama" to true "toss up" on its electoral map, in the wake of Mitt Romney's naming of House Budget Chairman Paul Ryan, a seven term congressman from the Badger state, as his running mate.

Mitt Romney hopes this November to do what no Republican has done in 24 years: win Pennsylvania in a presidential election. And a new survey released Thursday suggests the race for the state's 20 electoral votes is tightening up.

A new national poll indicates that Mitt Romney's announcement of House Budget Chairman Paul Ryan as his running mate has not made an immediate impact on the race for the White House.

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Notes

The CNN Polling Center displays data from polling organizations that use CNN-approved polling methodology as well as some that do not. The asterisk symbol * indicates that the poll or polling organization does not meet CNN's methodological standards. A CNN Poll of Polls is calculated using at least three polls that use CNN-approved methodology. The Congressional Ballot polling data was provided by PollingReport.com.